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The full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the other - ground plane spokes can be used for a single 0.15 mm² wires, reinforced insulation, conductor diameter 2.4mm, see http://www.philmore-datak.com/mc/Page%20197.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_TE-Connectivity THT Terminal Block Phoenix MKDS-1,5-9, 9 pins, pitch 3.5mm, size 42.7x7mm^2, drill diamater 1.1mm, pad diameter 2.6mm, see http://www.4uconnector.com/online/object/4udrawing/10694.pdf, script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00028, 7 pins, pitch 10mm, size 92.3x14mm^2, drill diamater 1.3mm, pad.

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